private Expression GetSmallerValueExpression(BuildPropertyExpressionContext context, Type type)
{
var name = $"{context.Property.Name}-start";
var lowerBoundQueryValue = context.ValueProvider.GetQueryValue(name, type);
context.ModelState.AddIfValueNotNull(name, lowerBoundQueryValue.ModelState);
context.IsHandled |= lowerBoundQueryValue.ModelState != null;
if (lowerBoundQueryValue.Value == null)
{
return(null);
}
var lowerBound = lowerBoundQueryValue.Value;
return(Expression.GreaterThanOrEqual(
context.PropertyExpression.Type == type ?
context.PropertyExpression :
context.PropertyExpression.Property("Value"),
Expression.Constant(lowerBound)
));
}
public override Expression BuildExpression(BuildPropertyExpressionContext context)
{
if (context.Property.PropertyType.NotIn(typeof(DateTime), typeof(DateTime?)))
{
return(null);
}
var after = GetAfterStartDateExpression(context);
var before = GetBeforeEndDateExpression(context);
if (after == null && before == null)
{
return(null);
}
context.IsHandled = true;
if (after != null && before != null)
{
return(after.AndAlso(before));
}
return(after ?? before);
}
public override Expression BuildExpression(BuildPropertyExpressionContext context)
{
if (context.Property.PropertyType.NotIn(typeof(int), typeof(int?), typeof(decimal), typeof(decimal?)))
{
return(null);
}
Type type = context.Property.PropertyType;
var upper = GetLargerValueExpression(context, type);
var lower = GetSmallerValueExpression(context, type);
if (upper == null && lower == null)
{
return(null);
}
context.IsHandled = true;
if (upper != null && lower != null)
{
return(upper.AndAlso(lower));
}
return(upper ?? lower);
}
